Press for making side plates for sash-pulley casings.



A. JOHNSTON.

PRESS FOR MAKING SIDE PLATES FOR SASH PULLBY GASINGS.

APPLICATION FILED AUG'.15, 1910.

994,929, Patented June 13, 1911.

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A. JOHNSTON. PRESS FOR MAKING SIDE PLATES FOR SASH PULLEY UASINGS. APPLIOATION FILED AUG. 15, 1910. I

994,929. Patented June 13, 1911. V

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A. JOHNSTON. PRESS FOR MAKING SIDE PLATES FOR SA SH PULLEY CASING-S.

Pater ited Jupe 13,1911.

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994,929, Patented June 13, 1911.

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A. JOHNSTON. PRES$ FOR MAKING SIDE PLATES FOR SASH PULLEY GASINGS.

APPLICATION TILED AUG. 15, 1910.

994,929, 7 Patented June 13,1911. F9 6' GSHBBTS-S HEIIT 5.

UNIE I ALLEN JOHNSTON, 0F OTTUMWA, IOWA.

PRESS FOR MAKING SIDE PLATES FOR SASI-I-PULLEY CASINGSQ To all whom it may concem:

Be it known that I, ALLEN JOHNSTON, a citizen of the United States, residing in Ottumwa, in the county of VVapello and State of Iowa, have invented a new and useful Improvement in Presses for Making Side Plates for Sash-Pulley Casings, of which the following is a specification.

My object in this invention has been to produce a machine capable of manufacturing sheet metal parts requiring a series of impressions to form them, such for instance as side plates for the casings of sash pulleys, and I have endeavored by the invention to render it possible to manufacture such parts from long or continuous strips of sheet metal of a width suitable for the parts without any interruption in the manufacture or any handling of the material after it has been started into the machine.

The construction of the machine and its mode of operation are set forth in the following description and will be fully understood from such description when considered in connection with the accompanying drawings forming a part of this specification.

In said drawings, Figure 1 is a front elevation of the machine; Fig. 2 is a side elevation partly in section; Fig. 3 is a section on the line 83 of Fig. 1; Fig. 1 is a section on the line 4-4 of Fig. 1; Fig. 5 is a section on the line 5-5 of Fig. 2; Figs. 6 and 7 are sections on the lines 66 and 77 respectively of Fig. 5.

My machine embodies a number of subpresses adapted to operate in succession upon the blanks and form them step by step into the shape desired. These presses are arranged side by side in a frame composed of two uprights 10, 10 connected together at the top by a cross-piece 11 and also united at the bottom by base 12 and by an intermediate plate 13. In the uprights 10 the main shaft 1 1 of the press is journaled. This shaft carries at one end a loose pulley 15 and a drive pulley 16 adapted to support the driving belt, and at the other end said shaft carries a fly wheel 17 and a pinion 18 meshing with the large gear 19 on a parallel shaft 20 which I denominate a cam shaft as it carries the cams by which the action of the different die presses are regulated. The main shaft between its bearings in the uprights is provided with a number of cranks 21, 22, 23, 24, and 25, each of which Specification of Letters Patent.

Application filed August 15, 1910.

Patented June 13, 1911.

Serial No. 577,321.

furnishes the power for actuating one of the presses embodied in the machine. The first of these presses A is adapted to stamp into the metal of the strip from which the side plates are formed, a round boss or knob a.

The second is adapted to shape the round boss formed by the first press into the cone shape 6, thereby fitting the projection to serve as half of the bearing of the pulley in the completed casing in which the plate is used. third press C is adapted to punch an opening 0 in the end of the cone formed by press.

B. The fourth press of the series is shown at D and is adapted to sever the side plate This press I designate as B. The M blank cl from the strip. The final press is '17 shown at E and its purpose is to cut up the scrap a severed from the ends and edges of the side plates.

Each of the cranks above mentioned carries and actuates a head in which a depending stud or pitman 30 is secured, and through such stud gives motion to the movable die carrying member 36 of the press corresponding to the crank. The head consists of a block 27 below the crank, and retaining 7 pieces 28 located above the crank and secured to the block 27 by bolts 29. The crank is surrounded within the head by an adjustin ring 26, operable from the exterior,

and adapted by changing its position to invertically by the ring 26 and its upper sur- 7 face is inclined correspondingly to the wedge 34, and such wedge 34 is retained in place by a screw 35 passing through it and threaded in the block 27. While the pitman is in the position given in Fig. 1 it is adapted to transmit power from the crank 23 (which is the crank shown in said figure) to the movable die member 36 of the subpress, and the pitman is brought to this position whenever the flattened side 39 of the cam shaft comes opposite the lever 37 as shown in said figure, and allows said lever to swing on its pivot 88 under the force of spring 41 so as to draw the pitman toward the member 36. While the pitman is in this position, the rotation of the main or crank away from the lever 37 and the latter rides over and .upon the :rounded surface of .the shaft. This causesa reversed lmovementof the ilever, in which ;through :the rod :40 it swingsthe pitman 30 away fromand outof its iengagement Wlthth8 diernember 36 as indicated inzthecase of anadjoining pitman 30 at Fig. 4, andholds lit .in that changed position until the surface 39 returns to :the position of Fig. 4 and allows'thelever and pitman'to :return .to the position shown in that figure. In thisswinging ofzthe pit-man into and outof operative position, it will be understood that Lthepitman supporting head swings on its crank. It .will also be noted that the pitman 30zhasa hook shaped projection .42 =whichis engaged'by the rod 40. As the rod extends throughan opening in the member 36 this feature enables the pitman to lift the member 36 toitsnormal position after each operation. A friction spring 43 ;is also employed to,hold;the.movableidie member in normal position between operations, and a screw .44 and bearing piece 45 are also preferably used with the spring.

WVith-the exception of minor details peculiar to-the dies ofgthepresses,allthepresses are identical with the one .above described, all having similar heads operated by the cranks, similar pitmen carried by the heads and adapted to make and .breaktheir connection with the movable dielmembers, similar camsurfaces .39 on the cam shaft and similar levers operated by said cam surfaces and springs 41,and controlling thepositionof the .pitmen. The 'cranksare differently arranged around ;the .axis of .the shaft, so that the presses will operate successively in the -.order in which they are arranged,.instead of simultaneously, so as not to. drawtoo heavily uponthe motive power atianyonetime. The camrsurfaces 39 are also timedwith reference tothecranks so that they will not ELllOWtllQPltHlQIlftO'bG in operative position at anytime when operationby thepresseslto which they belong is not desired.

The strip X from which the blanks are cut, is fed at. proper intervals betweenthe operationsupon it,.by suitable mechanism of which. the preferred construction is shown in .the (drawings. ,It embodies a lever 50, pivotally hungon' the lower end of a Vertical lever madein two parts 51 and 51 united by a pivot 52, and'swung' in one direction by aroller 53 bearing on acam 54 formed on the end of the cam shaft 20, and in the other direction by a spring 55 attached to the upper end of the lever and to a stationary. pin 56. At its lower end the lever 50 bears the extent ofthe length of a side plate blank.

The lever 50 is pressed down on the strip by the spring 57. Coacting with the feed device isa lifting lever 58, stationarily pivoted at 59,,and having a foot-60 extended under thestrip X, and also having its upper end extended into proximity to the .cam shaft 20 and having a roller 6lsbearing-on the said shaft and ridingover the, riser 62 thereon. hen the riser acts on the lever (and it does act slightly in advance of;the feeding mechanism) the outer end of the foot will be raisedand will lift the strip soasto free it from the boss :forming dies, and thus enable the feeding mechanism to feed the strip forward.

The cam shaft isgeared'to the main shaft so that-it revolves only about one-fourth as fast as the latter, and :the feedactuations occur only after all the pressesghave operated on the-strip. That is to say, allthepresses operate successively and in the order of. their arrangement and at difierent points on the strip, between the feeding operations. But the presses are located at such distanceuapart aspermits a side plateblank to intervene between .each .adjacent pair of presses, thus separatingthe points at which operations occur by the added length of the intervening blanks and preventing any injurious effect by one press-upon the o-perationofanother. As the boss forming press contracts the metal surroundingthe bosses formed by it while the cone shaping press expands the metal surrounding the cone, the importance of separatingthe operating pointsinthis manner will be seen.

A springlifter 63 is preferablyemployed asshown at Fig. 5 to assist in lifting the strip X after the boss forming :dies have acted upon it. ,A guiding flange 64 is also desirable on this lifter. The diesqofpresses A and B need no description. The 'die of press C is a punching die, andqembodies a punch 65 and a spring pressed positioning die 66 adapted to center the cone for the action of the punch and also an escape passage 67 for the metal removed. by. the punch. The dies of press "-D are adaptedto out the blank to the form desired, andthose ofpress E simply sever the waste transversely. The machine is desirably provided with a clutch at 68 for starting it, and itis controlled'by a foot treadle 69 and a connecting rod 70.

I claim:

1. The press for fashioning sheet metal' blanks comprising a series of Sull-PI'QSSGS,

each connected to a sourceof power by a separate transmitting device, all said transmitting devices being adapted to disconnect from the power source and to reconnect therewith automatically, means for regulating the disconnecting and reconnecting of said transmitting devices, and means for feeding a strip of metal through the presses.

2. The press for fashioning sheet metal blanks comprising a series of sub-presses each connected to a source of power by a separate transmitting device, all said transmitting devices being adapted to disconnect from the power source and to reconnect therewith automatically, and means for feed ing a strip of metal through the presses.

3. The press for fashioning sheet metal blanks comprising a series of sub-presses, a shaft actuating the sub-presses and having a separate eccentric for each sub-press, such eccentrics being so arranged that only one sub-press shall act upon the metal at a time and transmitting devices connecting said sub-presses with the eccentrics, all said transmitting devices being adapted to disconnect from the power source and to reconnect therewith automatically, and means for feeding a strip of metal through the presses.

4:. The combination in a press for manufacturing side plates for sash pulley casings from continuous strips of sheet metal, of a series of sub-presses arranged side by side in the order in which they operate upon the metal, an actuating shaft having separate eccentrics for each press, a head pivoted on each eccentric and carrying a depending pit-man adapted to engage and depress the movable member of the corresponding press, means for automatically swinging all said pitmen into and out of engagement with said movable members between operations and means for feeding the strip lengthwise to the press.

ALLEN JOHNSTON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

